RATARG _ _ _ _ _ _ _ _ _ _ _ _ switch

When ratarg is on, rational expressions can be given to operators such as coeff and lterm that normally require polynomials in one of their arguments. When ratarg is off, rational expressions cause an error message.

examples:

aa := x/y**2 + 1/x + y/x**2; 
 

         3      2    3
        X  + X*Y  + Y
  AA := -------------- 
             2  2
            X *Y


coeff(aa,x); 

         3      2    3
        X  + X*Y  + Y
  ***** -------------- invalid as POLYNOMIAL
             2  2
            X *Y


on ratarg; 

coeff(aa,x);                
 

   Y  1      1
  {--,--,0,-----}
    2  2    2  2
   X  X    X *Y